Not sure I'm adding anything here, but I talked with John at OutFront Motorsports. He's building my 2.5 Subaru motor. He is very particular about the break in procedure: what oil (Motul 10/40 break-in oil or equivalent), what engine speeds (particularly in the first 1500 miles), oil changes at 100, 500, 1000, and the every 1000 miles up to 3000 total, then switch to whatever oil you want). He says it's critical to the sealing of the rings, etc.
Even at that a quart per 1200miles is within Subaru spec. but following the procedure should keep that much lower, unless you are running high performance pistons with greater clearances that stock.